I guess it will be C: atoms and molecules because according to Jhon Dalton's 
atomic theory :"all matter is made up of atoms"
and even if we think of other options think it by urself that not all matter is made up of them
        
                    
             
        
        
        
Answer:
Why is it important to learn about stem cells and stem cell research?
Researchers hope stem cell studies can help to: Increase understanding of how diseases occur. By watching stem cells mature into cells in bones, heart muscle, nerves, and other organs and tissue, researchers may better understand how diseases and conditions develop.
How does stem cell research affect society?
Research with embryonic stem cells may lead to new, more effective treatments for serious human ailments and alleviate the suffering of thousands of people. Diseases such as juvenile diabetes, Parkinson's disease, heart failure and spinal cord injuries are examples.
 
        
             
        
        
        
Answer:
A Wave the fumes from the test tube toward the nose with a hand and inhale
Explanation:
 
        
                    
             
        
        
        
Answer:
They are called alleles. 
Explanation:
Different versions of a gene are called alleles. Alleles are described as either dominant or recessive depending on their associated traits.